I have a Samsung Galaxy S4. As of a few weeks ago I have been getting text messages from several random numbers and "Class 0 Messages" spamming me trying to sell me "Herbal Incense". at first they were one or so a day, but they have become increasingly aggressive. I added each number to my spam list for the normal texts (and yet some are still making it to me).

short of changing my number (which i'd MUCH rather not do) I don't know how to get these spam texts and spam "Class 0 Message" to stop.